Do you think this hypothetical political scenario can apply in real life?

Source: Headwind by John J. Nance

Suppose that there’s a treaty for crimes against humanity, written, signed and ratified by all Europe’s states and, of course, USA. Under this treaty, every state can accuse someone of crimes like genocide, (of course against humanity). A further scenario: suppose Pinochet (yes, Pinochet) accused a former USA president of a genocide sponsorized by CIA in Chile. Of course, there’s no proof linking the president with the crime, but, there must be naturally a trial, a preliminary one, for which there must be established proofs, connections and responsibility. Naturally, Chile, under this treaty, has all the right to place the location of the trial in their country. Of course, being a dictatorship, Pinochet would ensure the USA president would never leave, much less sustain the process. So, enough about it. What do YOU say about it?